ST / NDefLib

Utility library to read and write Ndef messages from/to a Type4 NFC tag

Dependents:   NFC M2M_2016_STM32 MyongjiElec_capstone1 IDW01M1_Cloud_IBM ... more

Fork of NDefLib by ST Expansion SW Team

NDEF NFC library

This library provides an abstract API to create NDEF formatted messages and records and to read/write them from/to a Type4 NFC Tag.

Implementations

At the moment, the NDEF API is implemented by X_NUCLEO_NFC01A1 and X_NUCLEO_NFC02A1 Dynamic NFC Tag libraries respectively driving the X-NUCLEO-NFC01A1 and X-NUCLEO-NFC02A1 boards.

Message.cpp@4:eaf6c49a86e4, 2015-12-01 (annotated)

Committer:
giovannivisentini
Date:
Tue Dec 01 08:30:27 2015 +0000
Revision:
4:eaf6c49a86e4
Parent:
1:a0eeb478a45a
Child:
6:739e3211749d
add the possibility to change the record content + add doc

Who changed what in which revision?

UserRevisionLine numberNew contents of line
giovannivisentini 0:04b82ae7aa43 1 /*
giovannivisentini 0:04b82ae7aa43 2 * Message.cpp
giovannivisentini 0:04b82ae7aa43 3 *
giovannivisentini 0:04b82ae7aa43 4 * Created on: Nov 6, 2015
giovannivisentini 0:04b82ae7aa43 5 * Author: giovanni visentini
giovannivisentini 0:04b82ae7aa43 6 */
giovannivisentini 0:04b82ae7aa43 7
giovannivisentini 0:04b82ae7aa43 8 #include <cstdlib>
giovannivisentini 0:04b82ae7aa43 9 #include "NDefLib/Message.h"
giovannivisentini 0:04b82ae7aa43 10 #include "RecordType/EmptyRecord.h"
giovannivisentini 0:04b82ae7aa43 11 #include "RecordType/RecordText.h"
giovannivisentini 1:a0eeb478a45a 12 #include "RecordType/RecordAAR.h"
giovannivisentini 1:a0eeb478a45a 13 #include "RecordType/RecordMimeType.h"
giovannivisentini 1:a0eeb478a45a 14 #include "RecordType/RecordURI.h"
giovannivisentini 0:04b82ae7aa43 15
giovannivisentini 0:04b82ae7aa43 16 namespace NDefLib {
giovannivisentini 0:04b82ae7aa43 17
giovannivisentini 4:eaf6c49a86e4 18 uint16_t Message::getByteLength() const {
giovannivisentini 4:eaf6c49a86e4 19 uint16_t lenght = 2; //length size
giovannivisentini 0:04b82ae7aa43 20
giovannivisentini 4:eaf6c49a86e4 21 if (mRecords.size() == 0)
giovannivisentini 4:eaf6c49a86e4 22 return lenght + EmptyRecord().getByteLength();
giovannivisentini 0:04b82ae7aa43 23
giovannivisentini 0:04b82ae7aa43 24 std::vector<Record*>::const_iterator it = mRecords.begin();
giovannivisentini 0:04b82ae7aa43 25 const std::vector<Record*>::const_iterator end = mRecords.end();
giovannivisentini 0:04b82ae7aa43 26
giovannivisentini 4:eaf6c49a86e4 27 for (; it != end; ++it) {
giovannivisentini 4:eaf6c49a86e4 28 lenght += (*it)->getByteLength();
giovannivisentini 4:eaf6c49a86e4 29 } //for
giovannivisentini 0:04b82ae7aa43 30
giovannivisentini 0:04b82ae7aa43 31 return lenght;
giovannivisentini 4:eaf6c49a86e4 32 } //getByteLenght
giovannivisentini 0:04b82ae7aa43 33
giovannivisentini 1:a0eeb478a45a 34 uint16_t Message::write(uint8_t *buffer) const {
giovannivisentini 0:04b82ae7aa43 35
giovannivisentini 4:eaf6c49a86e4 36 const uint16_t length = getByteLength() - 2;
giovannivisentini 4:eaf6c49a86e4 37 uint16_t offset = 0;
giovannivisentini 4:eaf6c49a86e4 38 buffer[offset++] = (uint8_t) ((length & 0xFF00) >> 8);
giovannivisentini 4:eaf6c49a86e4 39 buffer[offset++] = (uint8_t) ((length & 0x00FF));
giovannivisentini 0:04b82ae7aa43 40
giovannivisentini 0:04b82ae7aa43 41 const uint32_t nRecord = mRecords.size();
giovannivisentini 0:04b82ae7aa43 42
giovannivisentini 4:eaf6c49a86e4 43 if (mRecords.size() == 0) {
giovannivisentini 4:eaf6c49a86e4 44 offset += EmptyRecord().write(buffer + offset);
giovannivisentini 0:04b82ae7aa43 45 return offset;
giovannivisentini 4:eaf6c49a86e4 46 } //else
giovannivisentini 0:04b82ae7aa43 47
giovannivisentini 4:eaf6c49a86e4 48 for (uint32_t i = 0; i < nRecord; i++) {
giovannivisentini 0:04b82ae7aa43 49 Record *r = mRecords[i];
giovannivisentini 0:04b82ae7aa43 50
giovannivisentini 0:04b82ae7aa43 51 r->setAsMiddleRecord();
giovannivisentini 4:eaf6c49a86e4 52 if (i == 0)
giovannivisentini 0:04b82ae7aa43 53 r->setAsFirstRecord();
giovannivisentini 4:eaf6c49a86e4 54 if (i == nRecord - 1)
giovannivisentini 0:04b82ae7aa43 55 r->setAsLastRecord();
giovannivisentini 0:04b82ae7aa43 56
giovannivisentini 4:eaf6c49a86e4 57 offset += r->write(buffer + offset);
giovannivisentini 4:eaf6c49a86e4 58 } //for
giovannivisentini 0:04b82ae7aa43 59
giovannivisentini 0:04b82ae7aa43 60 return offset;
giovannivisentini 4:eaf6c49a86e4 61 } //write
giovannivisentini 0:04b82ae7aa43 62
giovannivisentini 4:eaf6c49a86e4 63 void Message::parseMessage(const uint8_t * const rawNdefFile,
giovannivisentini 4:eaf6c49a86e4 64 const uint8_t length, Message *msg) {
giovannivisentini 4:eaf6c49a86e4 65 uint16_t offset = 0;
giovannivisentini 1:a0eeb478a45a 66 Record *r;
giovannivisentini 0:04b82ae7aa43 67
giovannivisentini 4:eaf6c49a86e4 68 RecordHeader header;
giovannivisentini 4:eaf6c49a86e4 69 do {
giovannivisentini 4:eaf6c49a86e4 70 const uint8_t headerLenght = header.loadHeader(rawNdefFile + offset);
giovannivisentini 4:eaf6c49a86e4 71 r = RecordText::parse(header, rawNdefFile + offset + headerLenght);
giovannivisentini 4:eaf6c49a86e4 72 if (r == NULL)
giovannivisentini 4:eaf6c49a86e4 73 r = RecordAAR::parse(header, rawNdefFile + offset + headerLenght);
giovannivisentini 4:eaf6c49a86e4 74 if (r == NULL)
giovannivisentini 4:eaf6c49a86e4 75 r = RecordMimeType::parse(header,
giovannivisentini 4:eaf6c49a86e4 76 rawNdefFile + offset + headerLenght);
giovannivisentini 4:eaf6c49a86e4 77 if (r == NULL)
giovannivisentini 4:eaf6c49a86e4 78 r = RecordURI::parse(header, rawNdefFile + offset + headerLenght);
giovannivisentini 0:04b82ae7aa43 79
giovannivisentini 1:a0eeb478a45a 80 offset += header.getRecordLength();
giovannivisentini 1:a0eeb478a45a 81 msg->addRecord(r);
giovannivisentini 4:eaf6c49a86e4 82 } while (offset < length);
giovannivisentini 0:04b82ae7aa43 83
giovannivisentini 0:04b82ae7aa43 84 }
giovannivisentini 0:04b82ae7aa43 85
giovannivisentini 0:04b82ae7aa43 86 } /* namespace NDefLib */